Radwanska, Kvitova fall; Wozniacki, Venus reach Dubai quarters

Dubai, United Arab Emirates (SportsNetwork.com) - Second-seeded former champion Agnieszka Radwanska and defending champ Petra Kvitova were sent packing, while three former world No. 1s, including Caroline Wozniacki and Venus Williams, reached the quarterfinals at the $2 million Dubai Tennis Championships.